Generating AWGN in matlab

1. How is Gaussian noise generated?
2. What is AWGN in Simulink?
3. How do you add additive white Gaussian noise to an image in Matlab?

How is Gaussian noise generated?

White Gaussian Noise can be generated using randn function in Matlab which generates random numbers that follow a Gaussian distribution. Similarly, rand function can be used to generate Uniform White Noise in Matlab that follows a uniform distribution.

What is AWGN in Simulink?

An AWGN channel adds white Gaussian noise to the signal that passes through it. You can create an AWGN channel in a model using the comm. AWGNChannel System object™, the AWGN Channel block, or the awgn function.

How do you add additive white Gaussian noise to an image in Matlab?

J = imnoise( I ,'gaussian', m ) adds Gaussian white noise with mean m and variance of 0.01. J = imnoise( I ,'gaussian', m , var_gauss ) adds Gaussian white noise with mean m and variance var_gauss . J = imnoise( I ,'localvar', var_local ) adds zero-mean, Gaussian white noise of local variance var_local .